<!DOCTYPE html>

<html>

<head>

    <title>你是小白使者还是左手写爱呢~？</title>

</head>

<body>

<canvas id="canvas"></canvas>

<style type="text/css">

    body{margin: 0; padding: 0; overflow: hidden;}

</style>

<script type="text/javascript">

    var canvas = document.getElementById('canvas');

    var ctx = canvas.getContext('2d');

    canvas.height = window.innerHeight;

    canvas.width = window.innerWidth;

    var texts = '0123456789'.split('');

    var fontSize = 16;

    var columns = canvas.width/fontSize;

    // 用于计算输出文字时坐标，所以长度即为列数

    var drops = [];

    //初始值

    for(var x = 0; x < columns; x++){

        drops[x] = 1;

    }

    function draw(){

//让背景逐渐由透明到不透明

        ctx.fillStyle = 'rgba(0, 0, 0, 0.05)';

        ctx.fillRect(0, 0, canvas.width, canvas.height);

//文字颜色

        ctx.fillStyle = '#0F0';

        ctx.font = fontSize + 'px arial';

//逐行输出文字

        for(var i = 0; i < drops.length; i++){

            var text = texts[Math.floor(Math.random()*texts.length)];

            ctx.fillText(text, i*fontSize, drops[i]*fontSize);

            if(drops[i]*fontSize > canvas.height || Math.random() > 0.95){

                drops[i] = 0;

            }

            drops[i]++;

        }

    }

    setInterval(draw, 33);

</script>

</body>​​​